Not only did Sonic Youth play a luminous acoustic version of the EVOL oldie "Star Power" (which you can buy right now from their site), but Kim Gordon actually had a dramatic role, playing herself. (Spoilers coming.)

The whole episode revolved around the two utterly unbearable parental characters, ex-rocker dad Rufus Humphrey and rich socialite mom Lily van der Woodsen, who have been maybe sorta kinda almost about to finally get together for virtually the show's entire run.

Last night, Lily got cold feet at their big Brooklyn Botanic Garden wedding, but a really annoying chain of events-- mostly revolving around their secret lovechild-- led to the indecisive couple eventually saying the hell with it and getting married. Kim Gordon, who apparently has one of those online minister certificates, performed the ceremony.

You know you're dealing with some incredibly rich people when the last-second budget alternative is to have Kim Gordon officiate at your wedding.

Sonic Youth's "Antenna", from latest album The Eternal, also soundtracked a montage on last night's episode, as did songs by Phoenix and Matt and Kim. And we learned that Rufus had opened for Sonic Youth at some point during his rock-star past.

Check out the full appearance below, via Videogum. But be warned-- if you want to watch Sonic Youth play "Star Power", you have to suffer through some plot development going on in the foreground.